Dental impression-tray



F.-W. WALLACE.

' DENTAL IMPRESSION TRAY.

APPLICATION FILED JAN- 20, 1921.

1,378,297. famed May1 7,1921.

, gvwwwtoz witness l Q66 W m a" Mme/1 o- NORRIS PETERS. |NC.. LlTHO-.WASHINGTON. D, C.

arrangement hereinafter umrnn stares PATENT OFFICE.

FRANK W. WALLACE, OF CHATTANOOGA, TENNESSEE, ASSIGNOR ONE-HALF TO ALBERTE. DOYLE, OF CHATTANOOGA, TENNESSEE.

DENTAL IMPRESSION-TRAY.

Specification of Letters Patent.

Application filed January 20, 1921. Serial No. 438,734.

I '0 all whom it may concern:

Be it known that I, FRANK W. WALLACE, a citizen of the United States,residing at Chattanooga, in the county of Hamllton and State ofTennessee, have invented certaln new and useful Improvements in DentalImpression-Trays; and I do declare the following to be a full, clear,and exact description of the invention, such as will enable othersskilled in the art to which 1t appertains to make and use the same. 7

My invention relates to lmprovements 1n dental impression trays and morepart1cu larly to a device of this character intended for the purpose oftaking impressions'for the more modern practice of removable bridgwork.ThlS requires a perfect 1mpression with a minimum of fracture of theimpression material, and my invention aims to fulfil this requirement byproviding a dental impression tray having an upstanding fin whichpartially splits'the impression material and thereby insures accuratecleaving. I

With the foregoing in view, the invention resides in the novelconstruction and described and claimed, the descriptive matter beingsupplementd bv the accompanying drawings.

Figure 1 is a top plan view showing one form of a dental impression trayconstructed in accordance with my invention.

Figs. 2 and 3 are respectively longitudinal and transverse sectionalviews as indicated by the lines 22 and 33 ofFig. 1.

Figs. 4:, 5 and 6 are duplicates of Figs. 1, 2 and 3 with the exceptionthat they show a slightly different form of construction.

In the drawings above briefly described, 7

7 length of said bottom, substantially along its center, is anupstanding relatively narrow flange or fin 4 which is provided on itsupper edge with an integral upstanding lug 5 as seen in Figs. 1, 2 and3, or with a plurality of such lugs as indicated at 6 in the otherfigures, the lug or lugs belng of slightly less height than the sidewalls 7 of the vcurved channel shaped tray,

tray 1 so as to cut almost entirely through the impression material whenit is placed in the tray, thereby insuring proper cleavage of theimpression material after taking Patented May 17, 1921.

the impression. The form of construction shown in Figs. 1, 2 and 3 .isintended for tak ng impressions of a number of teeth while the otherform of the invention is designed for taking an impression of a singletooth. The action of the device is the same in both cases and itwillinsure the unusually accurate impressions. which are necessary inconnection with removable bridgework.

From the foregoing, taken in connection wlth the accompanying drawing,it will be seen thatalthough my invention is of eX- tremely slmple andinexpensive nature, it will be highly eflicient and in every waydesirable, and since probably the best results may be obtalned from thedetails disclosed, such detalls may be followed if desired. I wlsh itunderstood however that within the scope of the invention as claimed,numerous minor changes may well be made. 'Furthermore, any desirable orsuitable mate-' rials may be used in the manufacture of the device,

and as beforestated the fin or the like may .be either permanently ortemporarily secured in the tray.

7 I claim:

1. dental impressiontray having an upstanding flange provided on itsupper edge w tl'i a vertical lug in the same plane with said flange andof slightly less height than the'side walls of the tray '2. A dentalimpression cup comprising a a relatively narrow flange rising from thecentral portion of said tray and extending substantially throughout thelength thereof, and a vertical lug rising" from the upper edge of saidflange and located in the same plane with said flange, said lug being ofslightly FRANK W. WALLACE.

